The new mom recently took to Instagram to share a photo (albeit, a sponsored post) of her in a black Waist Gang Society waist trainer, writing "waistgang has the BEST quality snap back products…"

The Kardashian-Jenner fam has long been touting waist trainers and corsets as a means to create their signature hourglass figures—Khloé even has a holiday-theme version—but the body-binding methods haven't exactly been met with approval from fans or health pros. And Kylie's latest post is no exception.

"Beautiful, but I hope it's safe," one follower commented. Another writing: "This is so unhealthy!!" People were chatting about the photo on Twitter, too, and some weren't happy with the post. "Find it so weird that the Kardashians/Jenners are multi millionaire uber cool influencers but still jam up their instas with basic, basic ads. Kylie I'm looking @ you with today's waist trainer #ad #spon," one user tweeted.

On using waist trainers for weight loss, one expert previously told us that these extreme body-reshaping contraptions can do more harm than good. "Being compressed makes it hard to breathe," said New York City nutritionist Brittany Kohn, R.D. in "Is Wearing a Corset the Secret to Weight Loss?" "And with so much pressure on your middle, it can lead to bruising and even organ damage."

And what about someone like Kylie who is only a few weeks postpartum? Is the potential danger amplified?

"Pregnancy can cause your abdominal muscles to become weaker and stretch," says "Dr. Nita" Landry, ob-gyn and cohost on The Doctors. "Getting back in shape by using a waist trainer can actually stop the abdominal and core muscles from strengthening... and yes, as far as causing harm, absolutely. Super-tight corsets can impact your breath and the diaphragm's ability to move, compressing all your organs, and lead to a lot of different problems."

And if you're still wondering about those hourglass effects? "It may look great as you're wearing it, but things are going to go back to place," assures Dr. Landry.

Some experts say it takes 6 to 10 weeks for a woman's body to naturally recover from the physical toll of giving birth, as post-birth contractions called afterpains shrink the uterus back down. Others assert a woman needs roughly a full year to recover. However, there's no strict timeline for recovering from childbirth, as every woman's body and genetics are different before, during, and after pregnancy, says Dr. Landry.